Bill has a set of 11″ backing plates for sale on eBay.

“Up for Auction is a set of 11 inch backing plates off an early 70’s cj5. They are hard to find parts. Use to upgrade you Willys jeep to 11 inch brakes to improve safety, and to add self adjusting brakes. This will fit the front or rear axle.

These backing plates can be used with the Willys mb, ford gpw, Willys cj2a, cj3a, cj3, cj5, m38 m38a1, and m170. These will also work with international scouts or any vehicle running the dana 27 or dana 30 front axle.”

View all the information on eBay